Thermostat switch



RUOS A HE SW ICH 1921. D JULY 13. FiLE I Fig. 5

Patented Dec, 19, 1922.

UNITED STATES PATENT QFFICE.

FRED C. BOYD, OF NEW HAVEN, AND ALBERT J. .BARNES, OF WEST HAVEN, CON- NECTICUT, ASSIGNORS TO THE FARADAY CO., 01'! NEW HAVEN, CONNECTICUT,

A CORPORATION.

THERMOSTAT SXVITCH.

Application filed July 13, 1921.

T 0 (12K whom it may concern:

Be it known. that FRED C. BOYD, a citizen of the United States, residing at New Haven, in the county of New Haven and State of Connecticut, and ALBERT J. BARNES, a citizen of the United States, residing at lVest Haven, in the county of New Haven and State of Connecticut, have invented a new and useful Improvement in Thermostat Switches; and we do hereby declare the following, when taken in connection with the accompanyinig drawings and the characters of reference marked thereon, to be a. full, clear, and exact description of the same, and which said drawings constitute part of this application, and represent, 1n-

Fig. 1 a front View of a thermostat switch constructed vention.

Fig. 2 a side view of the same, shown as mounted in the cover of a fireless cooker.

F ig.3 a front end view of the same, with the cap removed.

Fig. 4 a rear end view of the same.

a transverse sectional View of the same.

This invention relates to improvement in thermostat switches and, while adapted for various purposes, is especially designed for use in connection with fireless cookers, in which an electric heating-unit is employed. The object of this invention is to provide a switch which, after the temperature has reached a certain degree, will cut out the electric current, and the'invention consists in the construction as hereinafter described and particularly recited in the claims.

In carrying out our invention, we employ a casing 10 adapted to be mounted in the top lid 11 of a fireless cooker, or other device with which the switch is to be, used. In the casing. is a transverse partition 12, and mounted on the inner face of this partition is a.coil-magnet 13 provided with a hinged armature 14 adapted to engage with a latch-bar 15 pivoted to a post 16, also mounted on the inner face of the partition 12.

Secured to the latch-bar 15 is a block 17 of insulating material, to which studs 18 and 19 are connected, these studs being arranged in line with slides 20 and 21 extending through the partition 12, where their outer ends are connected to springs in accordance with our in-- Serial No. 484,281.

projects outward through the casing, and

is provided with an indicating-hand 32 registering witha scale 33 on the face of the cap 26. The innerend of the lever 31 is mounted on an offset-arm 50 of the spring 22, and is insulated from the post 48.

A feed wire 35 leads to a binding-screw 36, which secures the spring 23 in place,

and this connects through the slide 21 and stud 19, this. stud 19 being connected by a flexible wire 37 through a binding-post 38, where it connects with one of the wires 39 leading to a heating-unit 40; the other feed-wire 34 leading to a binding-post 41, where it is connected with the other 'wire 42 of the heating-unit, so as to form a circuit through the heating coils.

If the push-rod 24 is drawn up so the latch-bar 15 is engaged by the armature 14, the studs 18 and 19 will be in engagement with the slides 20 and 21, so the circuit to the heater is closed.

The stud 18 is connected by a flexiblewire 43 with the magnet 13, the other end .of its coil 44 being connected with the binding-post 41. Connected with the binding post 36 is "a bridge-Wire 45 connected with a frame-work 46, to which one end of the thermostat-band 27 is connected, the other end being coupled with a rockinglever 47' mounted on a shaft 48, which carries the contact-lever 28.

The indicating-lever 31 being set at the desired point, when the temperature rises to that predetermined point, it expands the thermostat-band 27 and turns the contactiever 28 into engagement with the. lever 31, and so closes a circuit from the feed-wire 34 through binding-post 41, wire 44, coil 13 of the magnet, thence out of the magnet through the flexible-wire 43, to the stud 18, slide 20, spring 22, and then through the metallic part of setting-lever 31, contact 30, contact-point 29, contact-lever '28, shaft 48, rocking-lever 47, thermostat-band 27, framework 46., bridge-wires 45 and 45, to a feedby releasing that bar so that it falls inward and breaks contact between the studs 18 and 19, and the slides 20 and 21 thus breaking the circuit to the heating coils and also through the magnet.

To re-set, the push-button is again pulled outward, which reinstates the parts in the positions above described.

We claim:

. 1. A thermostatic switch, comprising .a casing provided with a transverse partition, a latch-bar mounted on the inner face of the said partition and provided with an outwardly-projecting push-rod, a magnet mounted inside the partition and provided with a hinged armature adapted to engage with said latch-bar,

justable lever with which the thermostatband lever may contact, studs carried by the latch-bar in line with slides extending through the partition, feed-wires and cona thermostat-band 1 connected at one end with a lever, an adnect-ions from the feed-wires to the studs, said studs adapted to be held in engagement with said slides by said armature.

2. A thermostatic switch, comprising a casing provided with a transverse partition, an electric magnet mounted inside the partition and provided with a hinged armature, a pivotal latch-bar mounted inside the partition and adapted to be engaged by said armature, and provided with an outwardly-projecting push-rod, said latch-bar also provided with two studs arranged in line with two slides projecting through said partition, a thermostat-band, one end fixed and the other end connected with a movable lever, an adjustable lever with which the movablelever may contact, feed-wires, and connections from the feed-wires to the studs, and the connection through the slides and studs adapted to be broken when the electromagnet is energized.

In testimony whereof, we have signed this specification in the presence of two subscribing witnesses.

FRED C. BOYD. ALBERT J. BARNES.

Witnesses:

MABEL E. HoTcHKISs, AMELIA C. ROEHNER. 

